CVE-2021-42321

Published: Nov 10, 2021Modified: Jun 17, 2026CISA KEV

8.8

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 2.8 / Impact: 5.9

Source: NVD (Secondary)

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected (4)

Products: Microsoft: Exchange Server

1 product

Exchange Server

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Microsoft Exchange Server	Version 2016 cumulative_update_21
Microsoft Exchange Server	Version 2016 cumulative_update_22
Microsoft Exchange Server	Version 2019 cumulative_update_10
Microsoft Exchange Server	Version 2019 cumulative_update_11

References (7)

http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html

Source: secure@microsoft.com

ExploitThird Party AdvisoryVDB Entry

http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html

Source: secure@microsoft.com

ExploitThird Party AdvisoryVDB Entry

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321

Source: secure@microsoft.com

PatchVendor Advisory

http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party AdvisoryVDB Entry

http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party AdvisoryVDB Entry

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321

Source: af854a3a-2127-422b-91ae-364da2661108

PatchVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42321

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

No history available yet.